Mystery Misfire on 2
03-14-2016, 11:23 AM
#1
Junior Member
Thread Starter
Mystery Misfire on 2
I recently bought an 05 F150 FX4 with the 5.4 and it has miss on 2. It was missing for at least 2 months before I bought it. I figured it was just a spark plug issue and that it would be easy to fix... I was wrong.
I have replaced the coil pack, plug, injector, and gotten a compression test. The compression was about the same as the other cylinders according to the mechanic. He then checked the wires coming to the plug from the ECM and he said there was no signal at the plug or at the injector. He checked the wires for continuity and said there were no broken wires and concluded that it was the ECM. About $300 later, that new ECM didn't fix the issue. I need to know what is causing this. Everyone else I've asked is stumped.
I'm giving it one last shot before I just take it to the dealership and let them find the issue and deal with it. & It's going to be $100 just to have them look at it.
I have replaced the coil pack, plug, injector, and gotten a compression test. The compression was about the same as the other cylinders according to the mechanic. He then checked the wires coming to the plug from the ECM and he said there was no signal at the plug or at the injector. He checked the wires for continuity and said there were no broken wires and concluded that it was the ECM. About $300 later, that new ECM didn't fix the issue. I need to know what is causing this. Everyone else I've asked is stumped.
I'm giving it one last shot before I just take it to the dealership and let them find the issue and deal with it. & It's going to be $100 just to have them look at it.
03-14-2016, 11:23 AM
#2
